<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert show-icon :closable="false" title="注意：只允许为第三级分类设置相关参数" type="warning"></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cats">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <!-- 动态表格数据 -->
          <el-table border stripe :data="manyData">
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  closable
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="item.attr_id"
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditLog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="delParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加属性</el-button>
          <!-- 静态表格数据 -->
          <el-table border stripe :data="onlyData">
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  closable
                  v-for="(item,i) in scope.row.attr_vals"
                  :key="item.attr_id"
                  @close="handleClose(i,scope.row)"
                >{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditLog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="delParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDiaLogClosed"
    >
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改对话框 -->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDiaLogClosed"
    >
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Params',
  data () {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联双向绑定的数组
      selectCateKeys: [],
      // 激活的页签
      activeName: 'many',
      // 动态参数数据
      manyData: [],
      // 静态属性数据
      onlyData: [],
      // 控制添加对话框显示隐藏
      addDialogVisible: false,
      // 添加参数的表单对象
      addForm: {
        attr_name: ''
      },
      // 添加表单验证规则对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入内容',
            trigger: 'blur'
          }
        ]
      },
      // 控制修改对话框显示隐藏
      editDialogVisible: false,
      // 修改表单对象
      editForm: {
        attr_name: ''
      },
      // 修改表校验
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入内容',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取分类列表
    async getCateList () {
      const { data } = await this.$http.get('categories')
      if (data.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }

      this.catelist = data.data
    },
    // 级联选择框选项变化触发函数
    handleChange () {
      this.getParams()
    },
    // tab点击
    handleTabClick () {
      this.getParams()
    },
    // 获取参数列表数据
    async getParams () {
      // 证明没选三级分类
      if (this.selectCateKeys.length !== 3) {
        this.selectCateKeys = []
        this.manyData = []
        this.onlyData = []
        return
      }
      // 根据所选id，和所处面板，获取对应参数数据
      const { data } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      })

      if (data.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      data.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制按钮与文本框切换显示
        item.inputVisible = false
        // 输入的内容
        item.inputValue = ''
      })
      this.activeName === 'many' ? (this.manyData = data.data) : (this.onlyData = data.data)
      console.log(this.manyData)
    },
    // 监听表单关闭
    addDiaLogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (data.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParams()
      })
    },
    // 监听修改对话框关闭
    editDiaLogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮显示修改对话框
    async showEditLog (id) {
      const { data } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, {
        params: { attr_sel: this.activeName }
      })
      if (data.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }
      this.editForm = data.data
      this.editDialogVisible = true
    },
    // 点击按钮更新参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (data.meta.status !== 200) {
          return this.$message.error('更新参数失败！')
        }
        this.$message.success('更新参数成功！')
        this.getParams()
        this.editDialogVisible = false
      })
    },
    // 根据id删除参数
    async delParams (id) {
      const confirmRes = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      // 确认删除返回字符串confirm 取消返回cancel
      if (confirmRes !== 'confirm') return this.$message.info('已取消删除')
      // 请求删除接口
      const { data } = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
      if (data.meta.status !== 200) return this.$message.error('删除失败')
      this.$message.success('删除成功')
      this.getParams()
    },
    // 文本框失去焦点或者按下回车
    handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrValue(row)
    },
    // 点击按钮，展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick当页面上元素被重新渲染之后，才会执行回调函数中的代码
      this.$nextTick(() => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    async saveAttrValue (row) {
      // 发起请求，保存数据
      const { data } = await this.$http.put(
        `categories/
      ${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (data.meta.status !== 200) return this.$message.error('修改参数项失败')
      this.$message.success('修改参数项成功')
    },
    // 删除对应的参数项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrValue(row)
    }
  },
  computed: {
    // 按钮需要禁用返回true，不需要返回false
    isBtnDisabled () {
      return this.selectCateKeys.length !== 3
    },
    // 选中第三分类id
    cateId () {
      if (this.selectCateKeys.length === 3) {
        return this.selectCateKeys[2]
      }
      return null
    },
    // 添加对话框标题
    titleText () {
      return this.activeName === 'many' ? '动态属性' : '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cats {
  margin: 15px 0;
}
.el-tag {
  margin: 8px;
}
.input-new-tag {
  width: 120px;
}
</style>
